Demonstrator for indicating the effect of additive in engine oil and the like



FIG. 1 is an isometric view from an upper aspect of a demonstrator for indicating the effect of additive in engine oil and the like, showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a left side elevational view thereof; and

FIG. 6 is a right side elevational view thereof. 

The ornamental design for demonstrator for indicating the effect of additive in engine oil and the like, substantially as shown. 